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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0f0909c8a74917ad2d49732cb618464515936a603daa97512659a82d078dc0' 
  AND token = 'Ws1/d506K7cxC86mXyWqh/FN76bO3X5m5aGDdPYU0BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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