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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd5661d313dea3aa965ff1e36ad96c2864a1431b86297bddc9cd1ae9d1142a9' 
  AND token = 'nfym4h5aOwUguTE4amJL62NrpZBfhsampzr98/gSheo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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