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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e970fe485f59bd61fad91c24a909a6b8e23f516f438898a829a18f2a9018a1' 
  AND token = 'hdbzeID1QtqBoZr/vEj/svDu734eezDJoCysXAIPHYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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