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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3575d7837496acbf5b39578e7b7340fcfd7b0c7c516dd647fe331d43b1d4ba25' 
  AND token = 'abq0v5vXOiVMg9boVdcyKXbHACif5zCrr14zaOislNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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