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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df995708cb13af467f5e154d5c082ab8c936c3aebdab8b6d863c460a09030ed' 
  AND token = 'z/nyXUTigNWuc/HFlGFCmp5g7pbINHIJ0ArhtNnE0X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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