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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c1de312b392a00349cdf07b662c3c12af940519cf0e313ca5f3482d15163e6' 
  AND token = 'Hw8q4D/Sgm4YRGzB1MY4xABYhxNqCLSiSeHS7ch63n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}