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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99402161f5cbe0ed0bd98d113daa900113792328dceb2727eb466b9f914cef3' 
  AND token = '/05ZChWAHe5MGUJEeg+NWFh52glUahkdGAdfl9l/EXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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