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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c550d611300e920b780a1b312f20eaf0f05ac5660459d0077f947e769ada2e23' 
  AND token = 'CkI/29If1UOXhdVg58A3M+o+wolS4Sb9/JlG7fGbfjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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