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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d360409d4de523adae4ff290fb93c898e556f8d0553ca09092ca97300ca02be' 
  AND token = '0V+vJ41srcuvjcfQxiBtsKfIrzJbKUudvbGQGettbSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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