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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef95b3a30e06c3a43673f2f712f18d2e0843122ac9ce25b76325a7a10b2d79d' 
  AND token = '9XtyPiXnyQADCOZR/BC1XqjNM33ecxdQ7cOY4G8uGug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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