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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1b79fe0683e8e1ba5af141293886f194e5a8bb1c426ac3e9088608ae9e775d' 
  AND token = 'i0bAP6y9Y5ofhxhORHgj7zHJTuCB0nqU+OdYN8hP83o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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