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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06fcbbbb2f968d359e022d6cac7be3983824f7ef3254bd190d8f9106873c2f66' 
  AND token = 'kObQxy0FC5dRvStzVXM7G1DS1Y+8zJhrf/YFUL3PLQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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