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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472defaeebbd2b60e2e4203d7c492b17aa18538aa2c567bbf00b2ae37079fd6e' 
  AND token = '1K7fH9ZgJQLsgSQEW4LImTSw/my4+h0710lDYaX0Yuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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