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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8dfbc043c499f942c71e6987e41d98816cb9a967562c129faf3beeabe5f134a' 
  AND token = 'CQxuYzsCTmAcxcJ9vBW9vClnq67zkXkqcOJxW69CVp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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