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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9b0154ee6c3a5d5126dc3d8468ba236c9fc8f6420f129faeb9b061ac9486c7' 
  AND token = 'KbEnanG7taighPr08335l2g20gxoLs4mJwoMrGZhy+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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