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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b230f3a461b6bf306917acd74b508f755dffecb12ad542de0ca8d65ccdea2c4' 
  AND token = 'rk0ifcq1ymmodE2vnvWjZhCq4dmlDOYYpljmPvLh1a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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