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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8119c08b3e5fce0b1ed6fafc8d3927ce0c781311dd9119d4c43b5a7d5c9831ad' 
  AND token = '7UjW08Li03JRKcReVOmqKuwghm8OKC7M+mjAIbksMLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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