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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76d3a62a100315576fcf20371691d8afa10244e26bd24c25027e27497bdf5d0' 
  AND token = 'Qx5KPFzvx5IQtMofAkt5oZ06iKFdJBfr4fDxA6eWpq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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