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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765f846b9a0c0645bf3e6932a25bd07b6277b6f434561f7d448854444abc403b' 
  AND token = 'KPmDutCULAACUEWlcLpV2K4OpFpRHUTm4J4u0TQfbkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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