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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f8e87f4a587b86a3229eea5647ac3da67ec7359ac349cd7343e887c2ea98c4' 
  AND token = 'FcvusKs4ycgKbLVcRi1mLmjYcoi1z9pmYKpimxqmYD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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