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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c03ea6f5c5b92adac30e6dd6c7b511fd2404bcae89b9f30ee80bb719e87f66' 
  AND token = 'cISQEPHxb/BiYJL4vz309/srdmjEHnT8bmflDVa6qbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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