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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8017047536d86a27f1bbfc0917577cb4e5e9c4cb0ed51ef847bd18e5fb1e13fc' 
  AND token = 'xYtsZ0fHSJmpBPdBMVUjVNLT0kVbNTztr9ukFM+fsLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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