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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8aab2659e77be7bb3685e523c7be68e3cd9e0abc733766b3f9e5a0a0657632' 
  AND token = 'hXpfROfJkIGAWcFz2uR100EuilP0O055lMCN3Ir/mmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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