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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb481eb7c31022ee8ac51c4d2329b3f4cc3b2821bc86fb54d0451b6f197d36bf' 
  AND token = '5UjOxfpfmpCaTn2D4Kzaz0unpKRc54ci3FWtoEP2v58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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