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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a740a1a0277fbeba14d21060207fdd98ba7888ebf8063671eecdc20f0eeb399' 
  AND token = '1jibBgEYcUFu6FbtH/lRGJLRnxKkMtk9OjV9R4LV3hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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