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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad632689d7acc7b806d552b3ddffe45346a2b056fe645e4d5e262668293f147' 
  AND token = 'zKqy8N1NQDQsIh8bORDP3YZ0rhk3I7fYp2KjhxExRyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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