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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a06eb499a2c1a40181d84bb4ff2c10adb67cf3488ee757877e8ad7bf4b74ea5' 
  AND token = 'VAyWGIv1Rv5cDr3FvaqLH4jVNTo0R95xBjlezLGSxgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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