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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cd2cf8107039374b3dbf6f9c10606ac92a52b4ad5dfdd21c8af9904f505a8c' 
  AND token = 'jRxzlCy9wfohtSMESk+L2vpdZJpqtkXLbD6yWZ8vzSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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