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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3017ab154361748a72c1bc115b7554f132ed466710303572ce47b9d6918dc6' 
  AND token = '1P98bI1sxsbdI/6NiHn4GA9jPvda1Sra7qU+pqVvI9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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