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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef73f9bca3c45137a8881ebbefcfd4654fe7d9877c5f99e29f15e6db79eb3f6' 
  AND token = 'DMuuSEbZXvom2YMiaT4NTFhbS+TZd6UvUVdrfqrA7lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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