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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760aa40f8a72af3d2bddc63b5e3be9a6de35f5cf2525f170742415f38f45ab5a' 
  AND token = 'o73Akv6y/9r5ox6+EnE0BuwBeOj6cWOMZkfV6PPs0u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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