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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8927003bfa21c675aabf8355120a7673fd956dce2f099e666169d0190dff20d4' 
  AND token = '6ifImpLfoSNt3AWekaP8gZSZCGRU3Ck4B4SxVGnHZHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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