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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f0ff962a15db8b043b39f6ff09018601deb3c3fbb5405139c88b58d5dcd3fb' 
  AND token = 'CQ5h9WaJWgj3qirSbttvPy+qX9z1ndgdEZaaMiVq94E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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