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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbd089cb0d709d46500831bf97c3f03674697126e4af5690c5599f89b752844' 
  AND token = '27cjRa0LiT822a/keMk9zLdnzf1CvmP13W61HQ4rjYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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