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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1535bf4588545f210edae431ac30b66dec750102858da3467bcfa4df3488d4' 
  AND token = '1BZq2QUVczQvQH3AO3YB0mUwTVqgxHdeg5hv96Aor6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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