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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9f634f2162e1b20f8388f405abc6d7454e850cbb608f2aee28c5989f7a8ff2' 
  AND token = 'wS0zM189fuYw0bbXU96RjaJupTve+HpDpkLVNh7o8pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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