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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5903906c96cb5902563fc3c08e520384883b5088885828e4759c918b425abd3a' 
  AND token = 'ZgyNB1r4puAvuVD0cV9y4M1/3MdflOjECbmBYtxZ6q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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