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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24dd262b6babc38567b175a07c2bebd30ab3ba96acba9d986e0178ec26d37f25' 
  AND token = 'KHcofJiudYZ8lBIo1AadW9jqS/QRKXxgBF0TWYJPVAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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