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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf49d34565be7f96ca6d1c4b5b211630fc2fe1814b46d98ab3dbc05ef431f34' 
  AND token = 'pRgW9LkM6DoPLdARcpJCNFu7kRuesHB8DVo11yQiT1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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