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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff1df79818e4463283680c8832b8fa76b4ed1859e5e879f1a8cb5545ac92429' 
  AND token = 'dAQ/q/43z/abtvFPIF4AcJRICN2YUi7R7vfgzRMaD88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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