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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43cefa1274e9b67c99bb5f8444699b9a20ea7c6d6cb415b4a9fb19f3a2aadacc' 
  AND token = 'BR9XuhXS1DU/+/mom7TqSBsXprd47NZ84FF794GMBUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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