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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c660b49d12650ffa2ab3633fb87508cf29bf1becfcccd67ea8f61d968bbee085' 
  AND token = 'nibMZp2m7Xe/ccgr/ZXYiWBP/GLsUPK/CI7abNuXdC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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