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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d870877f7b80dd8e0309b1995315e5ae33ea67dc20cde4f6df3254b563f80e2' 
  AND token = 'IUXbf2Biu4DeiT9A8dgZtw9b6nlG95t5pEk4ByyYHCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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