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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e017913247b7eb6bb55cc607fc4dec65656e7986dad54dc831433ef78a3159b2' 
  AND token = 'gJcinilsZL0zOwN8jwuP4PLeaZv4hqwd83ADTZwUr8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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