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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a36dfcfd013973c533fc081b961a707f096d0cc93b77c3482aeb56881e575a' 
  AND token = 'EQ0RVVCkQl3UU77V+imqGc9R6EsKFwwqqSjf3xBIQxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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