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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a92d9ffddafaf50de2b001eabdbbc2364bae8219e0f6f64291b18de54127a3a' 
  AND token = '6dbEhH0FMPnGhxRpifYgCBL9Mj1zUX2ihSWG6jA7V+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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