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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad746cb6350220d2ad710d7bc07dd4f579ec7ee099863dba2640bbdc81b0d9e' 
  AND token = 'MLwqOVEHqNHeZXw2IdS3zT9lJgBTXG2Ice7JO6HEx+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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