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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46eaae0fcd7225c6d902322030365906bfe490d49281df955c82e973349800dd' 
  AND token = '95iCNxk9II43SFMZ9FLfYinM+WaoaMy6UJuiJqvqKiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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