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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0f094685c8cc9bad0cb533fe2ae51829d43d30b7e86ab80324d3bc74d2ebff' 
  AND token = 'U/A/Dp0AtgPrbNBN0yCUvXLpH1+gKOXHgMXw25H6Sio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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