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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bdbd0fd27429ed0068fa8a3d457d6d1f4fb6c0c30cf6dbb2185c4bef3f7bc4' 
  AND token = 'Wb/lICSaysS3T1he6pP2ieJe/81GTNdCKDpXxMagV3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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