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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7954b8a97eafd91855f446dd4252f2394923b98aa7733331b60c474ea487d4e' 
  AND token = 'EKp5BEcv+klwkLemA8MexScS1yhZfQhKkiXaxUH0n5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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