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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e366532abed365c9a84618ebdb4da6c8d92bc6be4e4e56fa7ed6c4cdd7ffe85f' 
  AND token = 'a8Fbo7C2igCbue5CLJfPsPHskuMjdgly1jD1kqhb2kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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