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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a273efd5a7728f96b275597329be4de7a4b551ca6502de09d3e6c3630bc63ae5' 
  AND token = 'blG3FMo4dAsDYNXhRM99cmBglLdEeqW/IEQRod5ky6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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