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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978115f1100a52fc9aef1c68a84577b464c420afc510745d2a6a5062c912eddf' 
  AND token = 'zokvAKZxnY6iAznttts+Jsts+QJ9g3cSaX48tP5PvSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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