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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370db8019aa3d4108eed235f3ef25dfb929692450ef6b39b05be9e5c0f3a87d5' 
  AND token = 'cr3PGgTDScG7TvVoZPSVNX4uLc3RlrKjvG3QsSxfIHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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