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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70b37b4f8837861b2f5dd246dccac41bcc787789375f59c8ec73c8cdf726e5c' 
  AND token = 'TWPuBnLdhCSE3+dKxIGyhU8Tgr3ON3bXioI39LOD98Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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