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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431e2f5fc4d2ad76e5312c9c42920284cde934fa0de3b9e23f6fff5c150fcc08' 
  AND token = 'oUUc0q/dN2SRGENk9jAmmop6Wsn7E1U67AK5tuShsG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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