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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1982e00c72832290b33988b833558ff40542ab056cf729e5cd2f53606265954a' 
  AND token = 'qz8FwUfCsYomy5ZkIc4xsmJeX12cg1Xn/1Qhdsc8TaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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