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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e19bd3f4928914e5eb0b3a7c961dd48b8b2cb84f137fc463ebc4234147a0b18' 
  AND token = '20kMd8jn6kLMUIodUAfh+UailKhjWrQqM5F4BQy+yhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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