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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c940d0602a76df7454e7b568a5db253cd5b0e0b23160ed02f7d9f2513932e04d' 
  AND token = 'rEHcw+Ps1Q+rgNl3S8nAGF3KF6FnES537qPLlLQwU/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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