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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9cccbb685ac6835fe54068f5f8f7ed9d9f17dc6ad40fede2ebb8cd4790dc6e' 
  AND token = '05mefJjdsgPQbKyCOQfgrW4ZD8N1LzOro59ZRMiPIio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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