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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcfa8e4d0c2673aad7dd87757b79125e708295c7384393bf527b5f07d8bdf83' 
  AND token = 'q1QSR/AiEDzbvbYmiBK6h7PQQUPcSn2P/5iPFGASa1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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