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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beff262eb32d95aeee8ef19bf5d50e2f9d35de804794b518b091d493f24fd867' 
  AND token = 'FpS/vjviLHjo6l+D9b6jvD8W+1Z5ck15Vq7XsmJfNFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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