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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9310626cabffaa2f57ecc7b056d12828f4c1ac33aa490ff27845470b84d34a53' 
  AND token = 've7/DUhnv80RAhsLPyhMc1MO+vXiwRAkomklJPzCnu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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